lotterypuzzle atlas

Bitcoin Puzzle record

Bitcoin Puzzle #28

found · spent

2.8 BTC nominal227 candidate keys

Where it sits on the line

Puzzles #16–#40: search work One column per puzzle; height is the base-2 logarithm of the search steps. Puzzle #28 is highlighted. The line sits at 2^69. #16 · 2^15 #17 · 2^16 #18 · 2^17 #19 · 2^18 #20 · 2^19 #21 · 2^20 #22 · 2^21 #23 · 2^22 #24 · 2^23 #25 · 2^24 #26 · 2^25 #27 · 2^26 #28 · 2^27 #29 · 2^28 #30 · 2^29 #31 · 2^30 #32 · 2^31 #33 · 2^32 #34 · 2^33 #35 · 2^34 #36 · 2^35 #37 · 2^36 #38 · 2^37 #39 · 2^38 #40 · 2^39
  • found
  • open · address only
  • open · public key on chain
  • the line · 269

This puzzle needs about 227 search steps — below the line (269).

Every puzzle below the line has been found.

Model: range scan. Every candidate key in the interval is hashed and compared with the address.

How the work is estimated

Record

P2PKH address
12jbtzBb54r97TCwW3G1gCFoumpckRAPdY
mempool.space Blockstream
Known public key
03e9e661838a96a65331637e2a3e948dc0756e5009e7cb5c36664d9b72dd18c0a7
HASH160
1306b9e4ff56513a476841bac7ba48d69516b1da
Search class
historical
The output has been spent. Dates and labels are catalog attributions, not audited identities.
Candidate interval
227 → 228 − 1
start0x8000000
end0xfffffff
Interval size134217728 scalars. Exact BigInt bounds, not a floating estimate.

Snapshot 2 Oct 2026. The reward is the catalog's nominal allocation (N × 0.1 convention from 2023-04-16; earlier spends predate it), not a live balance. A key that matches the address proves the math, not that the coins are still there: check an explorer. Missing fields are omitted, not invented.

Solution record

Catalog date
Block
339113
Evidence
On-chain
Catalog label
12x45A
A spend proves key control, not a forum identity.
Transactions
mempool.space tx Solve transaction · Blockstream

Where the key sat in its range

Published position in range: 69.6%

0% · start of rangeend of range · 100%

Published historical scalar (already public)

This hex scalar is already in the public puzzle corpus. It is historical evidence, not a live key to import. This page does not produce WIF and does not handle secret material.

000000000000000000000000000000000000000000000000000000000d916ce8

Method

Historical record. Method notes for open puzzles live on the method page.